Statistics – Methodology
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510541s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10541-10557.
Statistics
Methodology
72
Ampte (Satellites), Electric Fields, Magnetic Fields, Magnetopause, Plasma Acceleration, S Waves, Current Sheets, Earth Magnetosphere, Shear Stress, Temporal Distribution
Scientific paper
Four magnetopause crossings by the AMPTE/IRM spacecraft are analyzed using the methodology of Sonnerup et al. (1987), and the results are reported. In two crossings, it is possible to place lower bounds of 2.8 mV/m and 0.5 mV/m on the tangential electric field and correspsonding lower bounds on normal flow and field. In a third crossing, evidence is deduced which indicates that the observed plasma acceleration along the magnetopause had a large temporal component caused by a tangential gradient in the total pressure in addition to the usual convective component caused by the Maxwell shear stresses. In the fourth crossing, large magnetic shear was present, but no evidence for reconnection was present and the magnetopause had the properties of a tangential discontinuity. This case shows that the mere existence of a deHoffmann-Teller frame of reference in which the flow is field-aligned does not guarantee that the magnetopause is a rotational discontinuity.
Luehr Herman
Papamastorakis Ioannis
Paschmann Goetz
Sonnerup Bengt U. Ö.
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